I sold my 4x4 and now have a Scarlett 18i8 I got used at a good price. The Tascam wasn't friendly with my multiple use computer. I had to uninstall and reinstall the audio driver many times when switching between streaming videos and using SONAR. The Focusrite has no such issues. I DO NOT LIKE the new Mix Control so I am using the Windows beta driver and it works fine. The other issue I had trouble sorting out was
had different sample rates for different projects. Once I get that all sorted out, things will be smoooooth.
Other than multiple uses, I would also highly recommend Tascam. I do have a soft spot for Focusrite stuff tho... I will admit to that.